The resolving enzyme CCE1 of yeast opens the structure of the four-way DNA junction

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Abstract

Function-resolving enzymes exhibit structure-selective binding to DNA, but may also manipulate the DNA structure. CCE1 is a junction-resolving enzyme found in the yeast mitochondrion. To facilitate the analysis of the CCE1-junction interaction, we have exploited the sequence dependence of the cleavage reaction to devise a junction that is refractory to cleavage by this enzyme, even in the presence of magnesium ions. On binding to four-way DNA junctions, pure recombinant CCE1 opens the global structure into a 4-fold symmetrical configuration of arms with an open, chemically reactive centre. The structure of the CCE1-junction complex is independent of the sequence of the junction, and of the presence or absence of magnesium or other ions. This and other functional properties of CCE1 are strikingly similar to those of RuvC resolving enzyme of Escherichia coli. (C) 1997 Academic Press Limited.

Original languageEnglish
Pages (from-to)122-134
Number of pages13
JournalJournal of Molecular Biology
Volume266
Issue number1
Publication statusPublished - 14 Feb 1997

Keywords

  • recombination
  • DNA structure
  • Holliday junction
  • SITE-SPECIFIC RECOMBINATION
  • CLEAVES HOLLIDAY JUNCTIONS
  • CRUCIFORM CUTTING ENDONUCLEASE
  • ENERGY-TRANSFER ANALYSIS
  • RUVC GENE-PRODUCT
  • ESCHERICHIA-COLI
  • SACCHAROMYCES-CEREVISIAE
  • BRANCH MIGRATION
  • 4-WAY JUNCTION
  • PHAGE-LAMBDA

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